Wahl Lithium Ion Pro Series Pet Clipper, 9177. Powered by lithium ion technology, the clipper outperforms standard Wahl rechargeable clippers by providing up to two times the run time, clocking in at one hour and forty minutes on a full charge. This eliminates the need for frequent recharging, and provides uncompromised cutting while clipping your dog. It also provides: 3X more power then Wahl Basic Pet Clipper. Wahl Lithium Ion blades are designed for no snag - no pull. 15 minute quick charge for over 8 minutes of use. Performance is excellent for trimming, touch ups, and clipping fine hair. (# 9177) Heavy duty rotary motor Lithium Ion Battery - up to 2hr run time Secure-Snap Easy On-Off Attachment Clip for Snag free cutting Self-Sharpening Blades